Mechanical pinning of liquids through inelastic wetting ridge formation on thermally stripped acrylic polymers

Gang Pu, Jihui Guo, Larry E. Gwin, Steven J. Severtson

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

A film composed of a thermal-stripped, solvent-borne acrylic polymer is shown to completely arrest motion of the three-phase line for water as a result of ridge structure formation. This mechanism produces anomalous wetting behavior including the arbitrary selection of contact angles, formation of quasi-periodic ridge structures on surfaces, and requirement of stick and break motion for wetting line advancement, a novel mechanism reported here. The ridges are retained by the polymer subsequent to wetting, which are 2 scales larger in height than those described previously. This allows for their characterization, which shows significant detail including the hierarchical apex structure where a cutoff area is used in theoretical treatment to avoid a singularity. Results of Wilhelmy plate experiments show a spatial connection between quasi-periodic variation in force-displacement curves and the wetting ridges on plate. These results are consistent with the dominance of the viscoelastic properties of the substrate in determining wetting behavior.

Original languageEnglish (US)
Pages (from-to)12142-12146
Number of pages5
JournalLangmuir
Volume23
Issue number24
DOIs
StatePublished - Nov 20 2007

Fingerprint Dive into the research topics of 'Mechanical pinning of liquids through inelastic wetting ridge formation on thermally stripped acrylic polymers'. Together they form a unique fingerprint.

Cite this